While there are many reasons for a car to idle roughly, one of the most common is a vacuum leak. Even small leaks can cause the rough idle and illuminate the check engine light. Unfortunately the problem is often difficult to find, but once it's located, it's easy to fix. Popular Mechanics recommends starting with a copy of the vehicle's vacuum diagram and highlighting each connection when checked.
The government requires automobiles have an EGR valve that increases efficiency and a more complete burn of fuel. It recirculates a portion of the vehicle's exhaust through the combustion chamber to cool the temperature at which the fuel burns and decreases noxious emissions. The EGR system decreases the vehicle's contribution to the build-up of greenhouse gases. When this valve goes bad, it affects the engine idle. In addition to its effect on the engine performance, a bad EGR valve has the potential to stop the engine from running altogether. About.com recommends owners try to clean an EGR valve with carburetor cleaner before replacing it. It suggests cleaning valves without an electrical connection by soaking in cleaner overnight if possible. If the valve has a connection, it requires the use of a spray cleaner and brushes after removal from the vehicle.Learn More
While whistling noises in a car are due to several different problems, a vacuum leak is one common reason for this issue. Vacuum leaks also cause the car to run rough and stall. Worn, broken or cracked vacuum hoses are a common source of the leak, according to 2CarPros.com.Full Answer >
CarsDirect identifies three of the most common problems that cause a car to switch off while a person is driving: broken or worn vacuum hoses, faults in the fuel intake system or an electrical wiring problem. Any one of these issues may cause a car to shut off randomly, but by following some basic troubleshooting steps, drivers might be able to pinpoint the source of the problem.Full Answer >
The check gauges light illuminating in a vehicle simply indicates that one or more gauges is giving an abnormal reading. For example, the car could be running hot, or the gas could be low. In this case, the respective gauge light should also be lit. As soon as the problem indicated by the gauge is fixed, the light generally goes off.Full Answer >
When the Safety Restraint System light stays on, this means there is a problem with the airbag system. If the SRS light only blinks when the car is first turned on, this is completely normal. The SRS light blinks upon starting to indicate that the system is checking for malfunctions in the supplemental restraint system.Full Answer >